I also could care less about other parents.. But my daughter would not stop after 1 or 2 minutes. Even after 20. I tried it many times. Distractions mostly do not work neither as she was quite smart early enough :)
Not every single child is the same. Some need more powerful nudge towards behaving while others can sit in the carryon for 2 hours at movie theatre totally awake and not enjoying grown-up movie..